基于反步法的高超音速飞机纵向逆飞行控制

Longitudinal inversion flight control based on backstepping for hypersonic vehicle

针对高超音速飞机纵向运动的数学模型具有严重非线性、不稳定、多变量耦合以及不确定的气动参数等特点,采用非线性动态逆控制与反步法相结合的方法为其设计飞行控制系统.该系统以非线性动态逆控制作为控制内环,通过将非线性的多输入多输出系统进行精确线性化,解除了多变量之间的强耦合关系;并以反步法作为控制外环,保证系统的全局稳定以及抑制不确定参数的扰动.仿真研究表明,所提出的控制方法可以确保高超音速飞机的纵向稳定性,改善其飞行品质.

For the feature that hypersonic vehicle longitudinal motion model is highly nonlinear,unstable,multivariable coupled and includes uncertain aerodynamic parameters, its flight control system is designed based on the method, in which nonlinear dynamic inverse control with backstepping is combined. This system applies nonlinear dynamics inverse control as control inner-loop. The coupled multivariable relations are relieved by accurately linearizing the nonlinear multi-input-multi-output systems, and backstepping is adopted as control out-loop in order to guarantee global stability of the system and the effects of uncertain parameters are attenuated. The simulation studies demonstrate that the proposed method can ensure the longitudinal stability and improve the flight quality for hypersonic vehicle.